Burnt, I ran the OverDrive and it got to 4.7 then said to reboot. What was the purpose of that?
Assuming that you have reset your BIOS and all is on default, when you run the overdrive auto tune asked you to start the benching.
Assuming also that you left it and did something else away from your computer, it finished and asked you to restart yes?
When you restarted did you went back in to the overdrive to turn it on and set the speed at 4.7Ghz? It will not do it automatically, and that is the speed it will go with stock voltage.
Now, to get more than that, there three ways if not happy.
a) Go back to do the OC to BIOS like before. (as I had it also up to Friday)
b) Raise the voltage from BIOS. It will give you higher speed on the overdrive after the next benchmark run.
c) Use the Overdrive tuning from
http://sites.amd.com/us/game/downloads/amd-overdrive/Pages/overview.aspx
I had only little time to spend on this one today, however by using the same settings I had on BIOS via this software, I went back to 5Ghz without issue (controlling FSB and voltage from the app also and overclocking the RAM).
I will wait for the Magma fans to arrive to replace the Corsairs of the H100, before I go to 5.2-5.5Ghz. Which according to the AMD safety settings is feasible, but creates a lot of heat and had to stop the moment the AMD benchmark start running at 5.2Ghz.
Tbh since 1993 this is the first time I am relaxed about overclocking

Long gone the days we had to use switches on the motherboards to raise bus and multipliers, or BIOS only, and hope the system boots.